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Topic: What is this knob on my lower left dash on my 1968? (Read 2805 times)

My car is a project so I am just disovering things here and there. Can someone tell me what this knob does? It doesn't feel like it is connected. I pulled it part of the way out and there is an arm on it. Thanks for your help.

Yes, that system was called Astro Ventilation. The knob is connected to a tube that has a flapper valve to open and close air flow and that tube is connected with a flex tube that connects to the cowl.